package com.study.test.controller;

import com.google.code.kaptcha.Constants;
import com.google.code.kaptcha.Producer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;

@Slf4j
@Controller
@RequestMapping("kaptcha")
public class KaptchaController {
    @Autowired
    private Producer producer;

    @GetMapping("kaptcha-image")
    public void getKaptchaImage(HttpServletRequest request, HttpServletResponse response) throws Exception{
        response.setDateHeader("Expires",0);
        response.setHeader("Cache-Control","no-store,no-cache,must-revalidate");
        response.addHeader("Cache-Control", "post-check=0, pre-check=0");
        response.setHeader("Pragma","no-cache");
        response.setContentType("image/jpeg");
        String captext = producer.createText();
        log.info("当前验证码为{}",captext);
        request.getSession().setAttribute(Constants.KAPTCHA_SESSION_KEY,captext);
        BufferedImage bi = producer.createImage(captext);
        ServletOutputStream out = response.getOutputStream();
        ImageIO.write(bi,"jpg",out);
        try{
            out.flush();
        }finally {
            out.close();
        }
    }


}
